Scavenging pump of internal-combustion engine



ezine menne, en weeen', energien-if, eeereneie ne mieu emmene, er weeen,-

' ennmnni.

Appliee'ienlled eiobcr im, will, eriel le. l'fll, anni in Germany Ill'evemher w29.

My ina/eniicn relel'ee le nlernel combusien engines; :imi incre ci-qieeiiilljsf in lilie ecm"- eng'ing; pumps ecmliii'xei willi the g'iislcns 0E ffm-li engines. fil luis; pz-irlieiller reference le engines in which lllie single-neiging; piemi el? the scavenging pump is combined Wiijlx the single-acting; werking; pision el the engine.

lt is im object el my invention te provide an engine which is simple in ccnslrucien and smaller than elder 'engines of equal power.

In engines of lie linel mentioned above ille diameter of ille scavenging pump piston is consicierelily larger iiian die lieineter of he Working pieen it is combined willi. The :scavenging air is forced. from ille pump into e receiver and 'from'fcliere inte the working; cylinder.

According 'to my invention, this arrangement is grenly Simplified by eenveying ille scavenging' :iir deliveretiliy 'die pump im@ ille chamber adjoining ivlxe rezar lince el lie piston' *whereby 'llie length, lie Weight and the coste el 'the eng'i'xe are considerably re clneel.-

A further sini'nliiczilien obtained by :1r-- rengiz'ig "ille delivery viiiw ln the pieton 0l. the scavenging pump Se tem Seperate pipes cenneciing the pump with alle receiver :ire dispensed Willi.

My invention een be epplieciwli pin- 'iculzu :ifli'annge to engines cere?rising; pis ions Werking: in o'ppesi'te elirec'ions, eepechilly where belli pistone operate one commen three-throw' crank Shell.

in Such vengines die errengg'einen; el :i pump 'pieten direclly combined willi the Working pieren presents particular rlilieulties inesiniicli :is si stepped pump piston so combined i-ncri'aesee the Width el "the engine Whereas, il l'lxe pump pieten ne elliiciiecl to elle einer Wmlii K iii-e case nl vertenl enginee elle liciglil: ui'ilxe engine cmieiflemlily increase-fi. Vifili mi :xrizingensent el? the pump pieten :is relerreil to laet, iny invenlion nel; enly simplifies; elle design but also invelvee nelle? importent iidventegee, above ell :i ceneclerulile reduction in lengt/l1 er nei, lit.

n the drawings elliiel te this; specificetion anal forming; perl; tliereei, Several enn gines comprising;- pieens moving in epposite ali ectiene and embeflying; my inven'ti'in are illustrated diegrennnuicallf; by Way o'l exemple. lin' 'the drawings pieizen, ilie lenfgl'li, or iniee. le Ll: :we :sectional ele'vz'ilimie,

1g. 'l being; a horizontal twin shalt engine, :nifl

@ige 2 ie l 'vertical .ebree-throw crank elini'; engineev while Fig. 5 .ie a section on line V-V in Fig; l, enel lig. il is e sectional elevelion of the upper pennen of an engine l the old type.

En all 'the figures l is the Working cylm, iler, 2 enel 3 ere elle werking pistons, 4 is lliepisten ef the scavenging pump, is the crenl; sliziilh er elie'lfts, Y (Figs. 2 to 6) is e cross heed beam, 8 is the connecting rod of? the inner pieten 3, and il are the connecting reels of the onlie? pinion El. l2 fire the scavenging incl 'i3 the exhaust ports, Mis the lfnei inlet, l5 ille cylinder oi the Scavenging pump, 16 are the, suction und 17 the delivery valves of the scavenging. pump, 20 .ie the receiver for ille eczwenging air and 2l lle crank ease.,

Referring to liiv'. l, iw@ crank shafts 5 :ire nrrengeel et either enti. The piston e of 'elle scavenging pump ie integral with the werking pieton The scavenging pump ejyliniler is formed by limi; 'portion 'l5 0l the erenlf cese which surrounle the shalt 5 appeieiningg te piston 2. @n ine pistons moving nxwarcls, air is drawn into chamber l5 'llireugli valve i6. @n the return stroke, the nir escapes tlireugfh the delivery veli-'cs 17 errang-,geil in the pi'inip piston iteelf into the chamber 20 adjoining 'the pump piston and inte "which open the scavenging ports l2 of lie Werking cylinder. ln order .te keep 'the varieliens 0l pressure during scavenging' ae low ne pessible, jpcrs 28 vare provided, in "the supporting walls 2?, of the Werking cylinders so 'that the entire casingto the rear el ille perni) piston ie' utilized lo 'ferm e, receiver or greet capacity for the scavenging ein.

ln the vertical engine de'eloeeel in Fie. 2 llie pieton l ci the ecevenging pump is again integral with the werking piston 52. Since ille pump piston must be capable of supply ing` scavenging nir to beth Working pistons 2 and. 3, its diameter is so large that; the c011- neciinggj; rods 9 which are here illustrated. :1s engaging cross liezul beam 7 of the cuter 'wielen E2, but .may also lie connected directly 'le lle 'piscn can be arranged. Within the Cross-sectional aree ci elle pump piston. This is practically impossible in the existing 'type ofengines ina-uanuu'ah ue the receiver eur- 'rounfhng the scavenging port does not per The air delivered hy the :nieveiiilejiiigg pump flows into the receiver 2O tinough veive il? :nid pipe 1th' nud thencntere the ecevenging receiver tor the scavenging oir.

ports 12 The cross heed heine. 7 disposed immediately below the 'scavenging 'j iurup pibe ton t and isv connected with the cronies ehel't 5 by the connecting?, rods 9. Upeuinge 23 ere formed in the wail 22 between the 'Working` cylinder l and the crunkV cese throiugh which the connecting' rode 9 pees and v`-'.vhich allow the Whole casing 2l to he utilized oe :i re eeiver.

In theengine iliustreted-in Fig'. the pipe 18 is dispensed with and the delivery valves 17 are arranged in vthe scerenging pump piston 4t iteeht, so that 'the air drewn into chamher 'l5 on. the downward Stroke olf piston llt is diechergcd into the receiver 950 through valves l? on the return stroke of the piston. This reduces,I to e minimum the resistance to the circulation of the scavenging nir.

This engine is lui-ther provided. with tvvo scavenging ports exteniding;` es for es the outer end oit the Working1 cylinder l, so that 'the crees hond benin con enter them un it :upproncl'iee 'the hiner dead centre. (dwing to thin nrrungen'ient it ie poseihle to piece vthe dieten l5 nearer to the ecxivcngrinfr ports l2, 'whereliy :it lfurther reduction of the height or length of the engine ie ohtuined.

in thin engine ce well ce in the engine tiret described, the-workingv cylinder i is eupg'iorted in `the cugini/ 2t hy o 'wail Q2 provided *with openings 23 li'or the connecting; rods 9, so that here also the Whole casing; nete es u The 'welle or partitions 522 :further r "i the Qdi splashed uhout hy the crank e t 53 oss o' oil through the ecziveneing air being thus :wi'iifiedfus for are possible. if necessary., further cailles for retaining.; 'the oil n'ioy he arranged in the casing.

in order to entirely prevent iosses of luluicnting oil. i may use the arrangement illustrated in Fig. 4t. Here, the cross heed benin 7 is not directly connected with the crank @halt hy means oll coni'icctiuen rode 9, but rodeI 11, which are guided by cross heeds 10, are ii'ieerted between the heain 7 end 4the ci'mnectingg; rode 9, the passages i'nenaged for 'these rods in the pfnftitions 22 being so non row oreo weil pitched tluit no scavenging air can enter 'the canning 2l. only the cheinher 2O forming the receiver tor 'the nir.

In the engine illuetreted in Fig.. L, the

@ i i y :temere stroke of the outer piston 2 is coi'isidcrzihly shorter than that of the inner pieton 3. Pistone moving in opposite directions with different stroke have lbeen utilized before to reduce es 'fer as possible the inertie ellfects in the 'two gears. In the present case, however, the stroke ot the ece-venwing pump pisvtou is reduced also sotl'iet it is possible to C design this piston with. u large diameter ,in the oneinee lluetreted in Fics. Q to it' lli bi l no n'ieene ure provided tor preventing the pistone i2 and and the parte actuating; them :troni tui-huur about 'the une of the 'pis-tons. in order to orevent such turinno' nun'ement,

. j ,1 e the neuen e n'mv he 'Jrovlded with un armi l fw.

groove :ie iliuetroted in 141g. 5, und the pump cylinder with e corresponding axial ermee/tion 29.

e r d,

l Jthe 'variations or pressure Which occur :in [the seevengniM :ur yoperation o'lf the piston 4t, con he reduced in inulticylinder engines 'with cranks at different angles by interconnecting the receivers of the several cylindere.

The reduction of' height or length o1" the engine ond 'the simplification 0i' design 0b- 'toined by eid of the present invention are heet illustrated by o comparison with Fig. 6, in which en engine of usuel design is illustrated having` the seme proportions :is the engine iilustruted in Fig. et. The scavenging 'pump 15 delivere into e receiver 30 sur ,'roln'idini;` the scevengii'ig; ports 12. The cross heed hceni Z 'which projects on hoth sides muet he disposed :it u distance '/tl below the pump piston equal to the stroke otthis piston in order to keep the slots 31 n1 which 'the benin is ,L'uidcd eport from the interior of cylinder 15. Zihecross heed cannot he 'so arranged as to enter extended scavenging porte of 'the working; cylinder 1, as it oper etes in the open oir, from 'which' the sczwcngr ing;` oir receiver 30 moet he seperated. lThe Working piston 2 must therefore be cion- ;.nited for :ihout the distance it.: 'from the inner edges of the scavenging ports i2 to the upper end of the cylinder. The 'length or 'height ot' un engine of the usuel. design in, therefore, reduced in accordance with: the present invention lby the totrd of thedistonces h1 end h2, und, :it the suine time, the design oi the engine is much simplified.

wish it to he understood 'that do not desire 'to he limited to the exact detstile of construction shown and descril'ned, for obvious o'iodicfitious will occur to e person skilled in the, art.

Bti

iso

- in one 'haii ei Suid piu' Seaver @ou e? eeuneeug ms eounec'ngg mid ehe'ft wih se 'beanu u fsllgle uezug scavengmg pump pieten oi iai-ger diameter uigdly eeuueced with said secu-ud pieten, and. a eesed scavenging air 'pump Cylinder sur roumflingg Suid pump pieten alu :m inlet and im euie. sf'uve in une half 0i euu pump cjyiudm: nud c1umi'iul'ncu'uu beiweeu Sa outlet .'uveuud he iuet uf said working reds commuting; seid shui' with said beam,

ami u, eesed scavenging air pump cylinder suuuudugg' mid pump gisten and an net und uw euleb vulve in one naf of Suid pump E' and eouun'lulieuon between Suid euze suive uuu the inlet of Said Working eyuuer through the eher half of said pump cylue.

En un intezuu eombxton engine in eon'lbimol'l, e. emule ease, a Working' Cyluuesf, u uekug pistou in euducyliudel, a si ie ucz'xg :seaweugiugg pump pistou of larger G iuneer eouleeted with seid work- 1159; pieton, und e dosed scavenging air pump ejfnei surrounding Suid pump piston, and au ine and un eut-le; 've've in one half @if seid pump Cynder and Communication xeween Seid oulei; vuv-e and 'the inlet of Suid working" cylinder hrough 'the other half se pump cylinder and said Crunk ease.

S. En am nter'uu combustion engine in euzu'binuou, :L Crank euse, e, Working' Cyliuer, tw@ Wefkng 'pisous iu Suid cyndel' udupef'! te meve in opposite directions, e crunk ehuff und a connecting' rod connecting;r :mid s'hu; with une of seid pistons, a single acting scavenging' uit :1mm p pieten ui larger .umeeff Ceunoee wuzh s: d second pieten, u exe ieucf bezun zu'xfuuged dem en the rear fue@ elif Suid uu'up pieten, e puh' 0i :ze'rmue'f ilggg mm uenueeiug Saki. s'lm; willi seid begun, emi e, cloeeff scavenging; uur pulnp cyiude suruundiugg mi@ pump 'pleito-n, und um u'e' and zu oute waive in one half of :seid @ump cylinder und communication be @weee un" outlet veve und the iniet of Seid 'iffey cylinder t'u'ough the nher half ef Suid pump cyndel' und seid crank ease.

E'. lu en uterne combustion engine in een'ibinuon, u crank euse., u* workngg cylinder, we working pieeue in smid cylinder udzue; vie move in eppeste direetione, e erau shul; and e connecting roc' cosmesi;-

lud

ing sind shaft with one of said pistons, ii

#single acting scavenging air pump pieton 'the other half 'of Suid pump cylinder und 4sind crank case und a pzirtition intermediute'lhiit part of smid pump cylinderl which is connected to the inlet of said working cylinder and said crunk case offering pussages for said pair of connecting rods.

10. In en `internal 'combustion eninc in combination u crank-case, n wor ing cylinder, uworliing piston in Said cylinder` n single noting scavenging pump piston of liiigei' diameterconnected with saidl Working v'pisti.i1i,end le closed scavenging nii' pump cylinder 'surrounding said ypnuip piston, :i crunk sliiift, ii connecting rod connectvinirsiiid shaft .with one of said pistons, un inlet and nn .outlet vulve in one half of Said piiinp cylinder :md corriinnnicntion between sind outlet valve und the inlet of said working cylinder through' the other half of seid vpump cylinder and Suid crunk'case und partition intermediate that part of sind .puin'p cylinder which is connected to the inlet of sind working cylinder and Suid crunk case offering nn oil-tigl1t passage for said connecting rod.

ture.

connecting rod .connecting seid shaft with.

one of sind` pistons, e crosshea-d lu'eiimooiti` nected with sind second pistomfn. pair of connecting rods connectingl sind slmft with lsind bemin, scavenging ports in said .working cylinder, n. pair of open slots in said cylinder-extending; down to seid ports in line with' siiid beam, u single acting scavenging pump pieton ollnrger diameter rigidly connected with Huid second inton, und n cloned scavenging air pump cy inder surrounding` Huid puin piston und an inlet und un out- 1ct valve .in one hull. of said pump cylinder und coininunicutiou between seid outlet viilve und the, inlet of said working-cylinder through the other half of said `pump cylinder. y

12. ln im inlerniil combustion engine in combination, n working'cylinder, n. working piston in said cylinder, n single acting scavenging pump piston ol larger diameter connected with smid working piston, and va closed scavenging iiir pump cylinder surrounding said pump piston, im inlet and im outlet valve in one half of seid pump cylinder und coi'nmunicvtion between seid outlet. valve and the inletof said, working cylinder tlirou rh the other hnlf ofcsnid pump cylinder sind ineens for preventing circumferential movement of eaid pistons.

In testimony whereof I allix my signeorro Menen. 

